Ok I know different experience levels take different amounts of times to call in arty. I've no problem there.
The FOW explanation doesn't ring true though. Ok, FOW is great, everything else that is uses FOW to represent itself does so fine. You hear a light tank/halftrack - you get ??'s for the contact. You hear infantry - you get similar ??'s and a vague description of the unit.
If it's FOW that causes the time error in arty why do they have the countdown represented so accuratly down to the second? Surely it would make more sense to have it represented less exactly, go from 3 mins, 2 mins, to 1 min and leave it at that. Even have it say 'approx' or have ?? somewhere.